Q: MgBr OCH3
A: Ans
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- Why is the pH of sodium ethanoate greater than 7?The test solution should be acidified with nitric acid before silver nitrate is added to detect the presence of halides. Explain.Using hard-soft concepts, determine if the following reactions are predicted to have an equilibrium constant greater than 1? Explain your predictions. Unless otherwise stated, assume gas-phase or hydrocarbon solution and 25oC.
- For the aqueous ammonia (NH3) equilibrium, what affect would be observed if concentrated HCl were added?Chemical Equilibrium Write the equilibrium-constant expressions and obtain numerical values for each constant in (a) the basic dissociation of aniline, C6H5NH2. (b) the acidic dissociation of hypochlorous acid, HClO. (c) the acidic dissociation of methyl ammonium hydrochloride, CH3NH3Cl. (d) the basic dissociation of NaNO2. (e) the dissociation of H3AsO3 to H3O+ and AsO33- Using step-by-step processThe acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3×10−5. Part A Calculate the equilibrium concentration of H3O+ in the solution if the initial concentration of C6H5COOH is 0.060 M . Express your answer using two significant figures. part B Calculate the equilibrium concentration of C6H5COO−C6H5COO− in the solution if the initial concentration of C6H5COOHC6H5COOH is 0.060 MM . Express your answer using two significant figures.
- Verify that the equilibrium position for the reaction between phenol and hydroxide ion is on the right by comparing the pKa value of the acid on the left with that of the acid on the right. Which acid is stronger? do the same for the reaction of phenol with hydrogen carbonate ionA particular solution is 0.05M with respect to ethanoic acid and 0.2M with respect to sodium ethanoate (Ka for ethanoic acid = 2 x 10-5moldm-3). What will be the effect on the pH of the solution when one or two drops of 0.1M HCl are added to 1dm3 of solution. Explain your answer.Which of the following statements best describes the end point of the reaction and when you should stop the timer? Group of answer choices Once the purple color of the initial mixture, caused by the KMnO4, fades After 5 minutes have passed Once the KMnO4 has reacted completely with the malonic acid, turning the solution yellow Once the mixture turns colorless
- 1. Write the equilibrium-constant expressions and obtain numerical values for each constant in(a) the basic dissociation of aniline, C6H5NH2 .(b) the acidic dissociation of hypochlorous acid, HClO.(c) the acidic dissociation of methyl ammonium hydrochloride, CH3NH3Cl.(d) the basic dissociation of NaNO2 .(e) the dissociation of H3AsO3 to H3O + and AsO33- 2. The chemicals A and B react as follows to produce C and D: A + B ↔ C + DKe = [C] [D] [A] [B] The equilibrium constant Ke has a value of 0.30. Assume 0.20 mol of A and 0.50 mol of B are dissolved in 1.00 L, and the reaction proceeds. Calculate the concentrations of reactants [A], [B] and products [C], [D] at equilibrium. Using step-by-step processWrite the reaction involved when ascorbic acid is titrated with: Iodine Dichloro-indophenol solutionA physician wishes to prepare a buffer solution at pH = 3.82 that efficiently resists changes in pH yet contains only small concentrations of the buffering agents. Determine which one of the following weak acids, together with its sodium salt, would probably be best to use: m-chlorobenzoic acid, Ka= 1.04 × 10-4 ; p-chlorocinnamic acid, Ka=3.89 × 10-5 ; 2,5-dihydroxybenzoic acid, Ka = 1.08 ×10-3 ; or acetoacetic acid, Ka= 2.62 × 10-4 . Explain.